City of LaGrange Department of Public Services

Water Pollution Control Division

Manual of Technical Specifications Wastewater Pumping Stations

For the City of LaGrange

Wastewater Collection System Within the Corporate City Limits and the City’s Water and Sewer Service Area

This Document was Approved June 2007

Table of Contents: Pump Station Prohibited……………………………………………………………………………… 3

Professional Engineer Required …………………………………………………………………… 3

State of Georgia EPD Requirements ……………………………………………………………… 3

Planning and Zoning Requirements………………………………………………………………. 4

Department of Public Services Requirements ………………………………………………… 4

Legal Requirements and Documents ……………………………………………………………… 5

Submersible Pumps………………………………………………………………………………………. 6

Piping Considerations……………………………………………………………………………………. 11

Quick Connect Bypass ………………………………………………………………………………….. 11

Wetwell and Pump Station Site………………………………………………………………………. 12

Safety Ladder………………………………………………………… …………………………………….. 13

Trash Basket………………………………………………………………………………………………… 13

Back Flow Preventer on Potable Water Supply………………………………………………… 14

Chain Link Fencing……………………………………………………………………………………….. 14

Access Roads and Pavement………………………………………………………………………….. 16

Unpaved Areas …………………………………………………………………………………………….. 16

Hoist or Crane ……………………………………………………………………………………………… 17

Corrosion Prevention in Wetwell and Manholes………………………………………………. 17

Control Panels ……………………………………………………………………………………………… 17

Probe Controller System ……………………………………………………………………………….. 19

Emergency Backup Power – Generator ………………………………………………………….. 22

Monitoring Devices – Remote Terminal Units ………………………………………………… 24

Landscaping ………………………………………………………………………………………………. 25

Spare Parts ……………………………………………………….………………………………………. 25

Start Up ……………………………………………………………………………………………………. 25

Information Submittal Required at Start Up …………………………………………………… 26

Flood Plain Requirements……………………………………………………………………………… 26

Reserved Right To Change These Requirements w/out Notice………………………….. 26

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CITY OF LAGRANGE Pump Station Specifications

Sec.70-200 Pump Stations are Prohibited:

The City will consider allowing pump stations only in areas where gravity sewer is not feasible. The City will determine the feasibility of gravity sewer in each case and may not base its decision on cost to the developer/owner(s). If the proposed pump station has a regional impact of opening a much larger area for service, the

City will design and/or build the pump station and the developer/owner will be expected to share in the cost, as outlined in a legally binding development agreement between them and the City.

Sec. 70-201 Registered Professional Engineer Required:

Either the developer/owner’s engineer (at their expense) can design the Pump Station if these standards are met or the City of LaGrange can design, at the owner/developer’s expense. If the developer/owner decides to design the Pump Station, it will be the responsibility of the Designer to integrate all applicable criteria and guidelines into the design of the wastewater pumping station(s), which are to be incorporated into the City of LaGrange public sewer system. To the extent practical, wastewater pumping station designs shall conform to the design standards given herein. Deviations from the design standards must be brought to the attention of the City of LaGrange and waivers of the Design Manual must be justified, in writing, from an engineering evaluation standpoint and include consideration of life cycle costs and ease of maintenance. Review of owner/developer designs by the City of LaGrange may be accomplished through its consultant, cost of said review to be at the owner/developers expense. Approval or denial of a waiver request will be by return letter signed by the Director of Public Services. All reports, plans, and studies that are submitted to the City of LaGrange must be approved by and carry the seal of a professional engineer who is qualified to design sewerage conveyance systems and treatment facilities in the State of Georgia.

Sec. 70-202 State of Georgia requirements:

(A) Approval of EPD: All proposed sanitary sewer extensions require approval by the Georgia Department of Natural Resources, Environmental Protection Division (EPD), Engineering and Technical Support Program.

(B) Sanitary Sewer Extension Submittal Form: A Sanitary Sewer Extension Submittal form must be submitted to the EPD. This form is available from the City of LaGrange Public Services Department. A copy of each completed Sewer Extension Submittal Form must be supplied to the City’s

Public Services Department.

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Sec. 70-203 City of LaGrange Planning and Zoning Requirements:

It is the developer/owner(s)/contractor’s responsibility to contact the City’s Community Development Department and to comply with all requirements pertaining to the site where the pump station is to be built. It is the sole responsibility of the developer/owner(s)/ contractor to guarantee compliance with variances, stream set-back requirements, and right-of-way requirements. The City accepts no responsibility for noncompliance with any requirement set forth by federal, state, or local agencies.

Sec. 70-204 City of LaGrange Public Services Department Requirements:

(A) Property: It is the responsibility of the developer/owner(s) to obtain, at no expense to the City of LaGrange, all easements and properties associated with a pump station, force main, and gravity collection system. (B) Design Reports: Three copies of the design reports required herein shall be submitted to the Director of Public Services. The design report shall be in conformance with the City of LaGrange Master Plan, approved facility plan and/or preliminary reports submitted by the City of LaGrange. The design report shall also include the description of design criteria to be utilized, preliminary flow computations, design calculations, calculated system curves, surge protection analysis/recommendations, identification of land acquisition and easement requirements, number of property owners involved, listing of permit requirements and cost estimate based on unit costs for major elements of the work. In addition, the following design criteria shall be developed:

1. Site Development 2. Structural Design 3. Architectural Design 4. Hydraulic Analysis 5. Mechanical Design 6. Electrical Design 7. Process and Instrumentation Control 8. Corrosion Control 9. Odor Control 10. Noise Control 11. Secondary Power Supply

Once the design report has been approved by the City, design of the facilities may proceed. Milestone submittals of design plans and specifications shall be made at 30%, 60%, 95% and Final Design.

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At a minimum, the following information shall be supplied at the milestone submittals:

30% Submittal: Site plan, design schematics (showing station layout and major equipment), specification table of contents

60% Submittal: Complete civil, mechanical and structural design plans and preliminary technical specifications

95% Submittal: Complete design for all disciplines including electrical and architectural plans and details. Complete specifications including front end documentation. This phase should represent complete bid-ready contract documents from the Designer

Final Design: The 95% Submittal with the City of LaGrange’s final comments incorporated

Sec. 70-205 Legal Documents and Requirements:

NOTE: All documents must be original and must be in a format approved by the LaGrange City Attorney.

(A) Title Opinion: the developer/property owner’s attorney must provide the City of LaGrange with a current title opinion before the City will accept any associated deeds or easements.

(B) Fee Simple Ownership of Pump Station Properties

(1) Warranty Deed: the City of LaGrange shall become the fee simple owner of all pump stations and the developer/property owner must provide the City of LaGrange with a Warranty Deed.

(2) Quitclaim Deed: all banks and lending institutions that hold a security deed on the property associated with the pump station must provide a Quitclaim Deed to the owner of the property. A copy of the recorded Quitclaim Deed must be provided to the City. (C) Sewer Easements (1) Sewer Easement: the property owner must provide a minimum 20 ft wide perpetual sewer easement over, under, and through property(ies) containing sewer lines (See Manual of Technical Specifications & Construction Standard Details for City of LaGrange Wastewater Collection System). All Sewer Easements must include Meets and Bounds. (2) Consent and Subordination: all banks and lending institutions that hold a security deed on the property must provide a document consenting to and becoming subordinate to all Sewer Easements. All Sewer Easements must include Meets and Bounds.

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(D) Access Easements: (1) Access Easement: the property owner must provide a minimum 20 ft wide perpetual access easement over, under, and through property(ies) to access pump station(s) containing sewer lines. All Access Easements must include Meets and Bounds. (2) Consent and Subordination: all banks and lending institutions that hold a security deed on the property must provide a document consenting to and becoming subordinate to all Access Easements. All Access Easements must include Meets and Bounds. (E) One Year Warranty Period With Performance Bond (1) Performance Bond: the developer/contractor shall obtain a Performance Bond for a minimum period of one year after the City accepts the Warranty Deed for the Pump Station. The total aggregate penal sum of the Performance Bond shall be at a minimum equal to the total cost of all pumps, control panels, generators, automatic transfer switches, SCADA system, SCADA antenna, and crane. (2) Contract: the developer/contractor shall enter into a contractual agreement with the City of LaGrange guaranteeing all equipment and workmanship for one year after the City accepts the Pump Station and Warranty Deed. Sec. 70-206 Minimum Pump Station Requirements:

Note: The brand of pump, control panel and related equipment that is accepted by the City is limited to Flygt (or equivalent as approved by the Water Pollution Control Superintendent). It is mandatory that those persons or groups responsible for choosing the brand of equipment for any portion of a pump station project receive approval, in writing, from the Superintendent.

(A) SUBMERSIBLE PUMPS: (1) General: Pumps must be submersible, non-clog type and be equipped

with a submersible electric motor supplied with adequate submersible cable (SUBCAB) suitable for submersible pump applications. The power cable shall be sized according to NEC and ICEA standards and also meet with P-MSHA Approval. All pumps shall operate from three-phase power.

(2) Pump design: The pump(s) shall be automatically and firmly connected to the discharge connection, guided by no less than two

stainless steel guide bars extending from the top of the station to the discharge connection. There shall be no need for personnel to enter the

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wet-well. Sealing of the pumping unit to the discharge connection shall be accomplished by a machined metal-to-metal watertight contact. Sealing of the discharge interface with a diaphragm, O-ring or profile gasket will not be acceptable. No portion of the pump shall be directly on the sump floor.

(3) Pump construction: Major pump components shall be of grey cast iron, ASTM A-48, Class 35B, with smooth surfaces devoid of blow holes or other irregularities. All exposed nuts or bolts shall be AISI type 304 stainless steel construction. All metal surfaces coming into contact with the pumpage, other than stainless steel or brass, shall be protected by a factory applied spray coating of acrylic dispersion zinc phosphate primer with a polyester resin paint finish on the exterior of the pump.

(4) Pump seals: Sealing design shall incorporate metal-to-metal contact between machined surfaces. Critical mating surfaces where watertight sealing is required shall be machined and fitted with Nitrile or Viton rubber O-rings. Fittings will be the result of controlled compression of rubber O-rings in two planes and O-ring contact of four sides without the requirement of a specific torque limit. Rectangular cross-sectioned gaskets requiring specific torque limits to achieve compression shall not be considered as adequate or equal. No secondary sealing compounds, elliptical O-rings, grease or other devices shall be used.

(5) Pump cooling system: Each unit shall be provided with an adequately designed cooling system. The water jacket shall encircle the stator housing; thus, providing heat dissipation for the motor regardless of the type of installation. Impeller back vanes shall provide the necessary circulation of the cooling liquid through the water jacket. The cooling media channels and ports shall be non-clogging by virtue of their dimensions. Provisions for external cooling and seal flushing shall also be provided. The cooling system shall provide for continuous pump operation in liquid temperature of up to 104° F. Restrictions below this temperature are not acceptable.

(6) Cable Entry Seal: The cable entry seal design shall preclude specific torque requirements to insure a watertight and submersible seal. The

cable entry shall consist of a single cylindrical elastomer grommet, planked by washers, all having a closed tolerance fit against the cable outside diameter and compressed by the body containing a strain cable. The assembly shall provide ease of changing the cable when necessary using the same entry seal. The cable entry junction chamber and motor shall be separated by a terminal board , which shall isolate the interior from foreign material gaining access through the pump top. Epoxies, silicones, or other secondary sealing systems shall not be considered acceptable.

(7) Motor: The pump motor shall be induction type with a squirrel cage

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rotor, shell type design, housed in an air filled, watertight chamber, NEMA B type. The stator windings and stator leads shall be insulated with moisture resistant Class F insulation rated for 155°C (311°F). The stator shall be dipped and baked three times in Class F varnish and shall be heat-shrink fitted into the stator housing. The use of bolts, pins or other fastening devices requiring penetration of the stator housing is not acceptable. The motor shall be designed for continuous duty handling pumped media of 40°C (104°F) and capable of up to 15 evenly spaced starts per hour. The rotor bars and short circuit rings shall be made of cast aluminum. Thermal switches set to open at 125°C (260°F) shall be embedded in the stator lead coils to monitor the temperature of each phase winding. These thermal switches shall be used in conjunction with and supplemental to external motor overload protection and shall be connected to the control panel. The junction chamber containing the terminal board, shall be hermetically sealed from the motor by an elastomer O-ring seal. Connection between the cable conductors and stator leads shall be made with threaded compression type binding posts permanently affixed to a terminal board. Wire nuts or crimping type connection devices are not acceptable. The motor and pump shall be designed and assembled by the same manufacturer.

(8) Pump performance: The combined service factor (combined effect of voltage, frequency and specific gravity) shall be a minimum of 1.15. The motor shall have a voltage tolerance of plus or minus 10%. The motor shall be designed for operation up to 40°C (104°F) ambient and with a temperature rise not to exceed 80°C. A performance chart shall be provided showing curves for torque, current, power factor, input/output kW and efficiency. This chart shall also include data on starting and noload characteristics. The motor horsepower shall be adequate so that the pump is non-overloading throughout the entire pump performance curve from shutoff through run-out.

(9) Power Cable: The power cable shall be sized according to the NEC and ICEA standards and shall be of sufficient length to reach the junction box without the need of any splices. The outer jacket of the cable shall be oil resistant chloroprene rubber. The motor and cable shall be capable of continuous submergence underwater without loss of watertight integrity to a depth of 65 feet.

(10)Bearings: The pump shaft shall rotate on two bearings. Motor bearings shall be permanently grease lubricated. The upper bearing shall be a single roller bearing. The lower bearing shall be a two row angular contact bearing to compensate for axial thrust and radial forces. Single row lower bearings are not acceptable.

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(11) Mechanical Seal: Each pump shall be provided with a tandem mechanical shaft seal system consisting of two totally independent seal

assemblies. The seals shall operate in a lubricant reservoir that hydrodynamically lubricates the lapped seal faces at a constant rate. The lower, primary seal unit, located between the pump and the lubricant chamber, shall contain one stationary and one positively driven rotating tungsten-carbide ring. The upper, secondary seal unit, located between the lubricant chamber and the motor housing, shall contain one stationary tungsten-carbide seal ring and one positively driven rotating tungsten-carbide seal ring. Each seal interface shall be held in contact by its own spring system. The seals shall require neither maintenance nor adjustment nor depend on direction of rotation for sealing. The position of both mechanical seals shall depend on the shaft. Mounting of the lower mechanical seal on the impeller hub will not be acceptable. For special applications, other seal face materials shall be available. The following seal types shall not be considered acceptable nor equal to the dual independent seal specified: shaft seals without positively driven rotating members, or conventional double mechanical seals containing either a common single or double spring acting between the upper and lower seal faces. Cartridge type systems will not be acceptable. No system requiring a pressure differential to offset pressure and to effect sealing shall be used. Each pump shall be provided with a lubricant chamber for the shaft sealing system The lubricant chamber shall be designed to prevent overfilling and to provide lubricant expansion capacity. The drain and inspection plug, with positive anti-leak seal shall be easily accessible from the outside. The seal system shall not rely upon the pumped media for lubrication. The motor shall be able to operate dry without damage while pumping under load. The seal lubricant shall be FDA approved and nontoxic.

(12) Pump Shaft: Pump motor and shaft shall be the same unit. The pump shaft is an extension of the motor shaft. Coupling shall not be acceptable. The shaft shall be AISI type 431 stainless steel. The use of stainless steel sleeves will not be considered equal to stainless steel shafts.

(13) Impeller: The impeller(s) shall be of gray cast iron, Class 35B, dynamically balanced, double shrouded non-clogging design having a long throughlet without acute turns. The impeller(s) shall be capable of handling solids, fibrous materials, heavy sludge and other matter found in wastewater. Whenever possible, a full vaned, not vortex, impeller shall be used for maximum hydraulic efficiency; thus, reducing operating costs. Mass moment of inertia calculations shall be provided by the pump manufacturer upon request. Impeller(s) shall be keyed to the shaft, retained with an allen head bolt and shall be capable of passing any solids that may enter it. All impellers shall be coated with an acrylic-dispersion zinc phosphate primer.

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(14) Wear rings: A wear ring system shall be used to provide efficient

sealing between the volute and suction inlet of the impeller. Each pump shall be equipped with a brass, or nitrile rubber coated steel ring insert that is drive fitted to the volute inlet. Each pump must also have a stainless steel impeller wear ring heat-shrink fitted onto the suction inlet of the impeller.

(15) Volute: Pump volute(s) shall be single-piece gray cast iron, Class 35B, non-concentric design with smooth passages large enough to pass any solids that may enter the impeller. Minimum inlet discharge size shall be as specified.

(16) Protection: All stators shall incorporate thermal switches in series to

monitor the temperature of each phase winding. At 125°C (260°F) the thermal switches shall open, stop the motor and activate an alarm. A leakage sensor shall be installed to detect water in the stator chamber. The Float Leakage Sensor (FLS) is a small float switch used to detect the presence of water in the stator chamber. When activated, the FLS will stop the motor and send an alarm both local and remote. USE OF VOLTAGE SENSITIVE SOLID STATE SENSORS AND TRIP TEMPERATURE ABOVE 125°C (260°F) SHALL NOT BE ALLOWED. The thermal switches and FLS shall be connected to a Mini CAS (Control and Status) monitoring unit. The Mini CAS shall be designed to be mounted in any control panel.

(17) Explosion proof pumps: All pumps must be explosion proof for use in hazardous locations defined as Class I, Division I, Groups C and D. (18) Warranty: The pump manufacturer shall warrant the units being supplied to the City against defects in workmanship and material for a period of five years or 10,000 hours. (19) Service Capability: The pump manufacturer shall have an authorized

factory service center / stocking facility capability of completely servicing the required pumps within 120 miles of the project site. This facility shall also have the capability of performing field service, including routine inspections and maintenance contracts.

(20) Pump control device: The MultiTrode probe system shall be used to activate and terminate pump operation and to determine high and low level conditions. Pump controls shall be equipped with an alternating lead- lag pump option. A liquid-level float sensor shall also be supplied to serve as back-up to provide a high wetwell alarm.

(21) Chains required: all submersible pumps must be provided with chains connected to each pump, to aid in the removal of each pump from the wet

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well for maintenance purposes. Each pump shall be supplied with a mating cast iron discharge connection and be fitted with a Grip-Eye lifting system. The working load of the lifting system shall be 50% greater than the pump unit weight.

(22) Mix Flush Valve required: One pump shall be fitted with a Mix-Flush valve to automatically agitate the liquid in the wet well using a 90 degree discharge elbow and adjustable flushing period of 20 to 50 seconds.

(23) Storage and protection: Pumps and accessories shall be stored and protected in accordance with the manufacturer’s recommendations.

Pumps shall be completely drained prior to shipment. Suction and discharge ports shall be provided with plastic plugs. Each pump shall be secured to a wooden skid to facilitate handling and storage.

(B) PIPING CONSIDERATIONS: (1) Minimum velocity: All sewage piping shall be sized to maintain a minimum velocity of two feet per second; however, piping shall be at

least 4 inches in diameter.

(2) Ductile Iron: All pipe, fittings, and valves shall be ductile iron and shall be properly rated for the expected operating and surge pressures. All flange accessories shall be stainless steel. All pipe supports shall be stainless steel. (3) Avoid release valves: When possible, the force main should be routed at a positive grade to the existing sewer to avoid the need for air and vacuum release valves. (4) Force main termination: All force mains should terminate in manholes and be provided with energy dissipating outlets. (5) Check valves: Check valves should be iron body, bronze-mounted, outside lever with flanged ends and conform to AWWA C508. Shutoff valves should be eccentric, non-lubricated two-way plug valves with lever operators and flanged ends. (6) Flexible couplings: Only when deemed necessary by an engineer, flexible couplings should be used around the valves and at the pump outlet. These couplings allow slight misalignment during construction, are easily disassembled and reassembled, and impede the transmission of damaging forces. The City does not recommend “dresser couplings”. (7) Quick-connect bypass: A connection (10") for a quick-connect bypass pump should be provided in case of complete station failure. Location and size of quick- connect must be verified with Superintendent.

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(8) Hydraulic transients: An analysis to detect possible hydraulic transients should be done if the total dynamic head is greater than 30 feet and the length of the force main is greater than 1,000 feet.

(C) WETWELL AND PUMP STATION SITE:

(1) Wetwell Diameter and Volume: The wetwell diameter and wetwell volume must be reviewed and approved by the Superintendent.

(2) Precast Concrete Sections:

(a) Precast concrete sections shall meet the requirements of ASTM C 478. The minimum compressive strength of the concrete in precast sections shall be 4,000 psi. (b) Wall thickness shall be as shown on the Drawings. (c) Joint seals: Joints between precast sections shall be sealed by means of rubber O-ring gaskets or flexible butyl rubber sealant. Butyl rubber sealants shall meet the requirements of AASHTO M-198. Sealant shall be pre-formed type with a minimum nominal diameter of 1-inch. Butyl rubber sealant shall be equal to Kent Seal No. 2 or Concrete Sealants CS202. (d) Non-shrink grout: All pumps, compressors, motors and other

heavy equipment items shall be grouted in place with a nonmetallic, noncorrosive, nongaseous, nonshrink grout requiring no cutback or protective coating. Nonshrink grout shall be EUCO N-S Grout as manufactured by the Euclid Chemical Company, Masterflow 713 Grout as manufactured by the Master Builders Company, or Upcon High Flow Grout as manufactured by UPCO Division of Emhart Chemical Company

(3) Poured Sections (a) Poured Area Between Wetwell Top and Valve Box Top: The area between the wetwell top and valve box top shall be poured on site. All concrete shall be smoothed and finished in a professional manner.

(b) Poured Crane Counterweight and Finished Concrete Area Around Crane: The finished concrete area around the on-site crane shall

be poured in one single contiguous pour. All concrete shall be smoothed and finished in a professional manner.

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(4) Wetwell Top Door: (a) The wet well door shall be a double leaf type, built to withstand 150 pounds per square foot. (b) The frame shall be ¼-inch extruded aluminum with built-in neoprene cushion and with strap anchors bolted to the exterior. The door leaves shall be ¼-inch aluminum diamond plate reinforced with aluminum stiffeners as required. Stainless steel hinges shall be bolted to the underside and pivot on torsion bars that counterbalance the door for easy operation. The door shall open to 90 degrees and lock automatically in that position. A vinyl grip handle shall be equipped with a snap lock and removable handle. Doors shall also be equipped with a hasp and padlock in addition to built-in locking mechanisms. Padlocks for all doors shall be keyed alike and match the standard lock of all other City pump stations. Bituminous coating shall be applied to the exterior of the frame by the manufacturer. All parts shall be aluminum or stainless steel.

(c) Doors shall be Typed KD for double leaf doors by the Bilco Company or equivalent as specified by the City.

(d) All access doors and hatches must have the capability of being locked with a pad lock as required by the City.

(5) Ladder required:

(a) Steps provided by the wet well manufacturer that are preset into the walls of the wet well are not acceptable. (b) The ladder must be constructed of corrosion resistant material preferably stainless steel. (c) The ladder must be permanently mounted in the wet well to provide access for maintenance personnel. (d) The ladder must be equipped with a safety harness system. A separate safety harness must be provided for each wetwell. (e) The ladder must be 18 inches wide. (f) Each step must be roughened to prevent foot slippage.

(6) Trash basket required: A trash basket and rail system or grinder may be required for each influent pipe to the wet well. Each trash basket must

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be easily removed from the wet well for cleaning purposes.

(7) Conduit: All conduit that enters a wet well must be sealed at the wet well and at the motor control panel. No conduit junction boxes will be allowed inside the wetwell. (8) Lighting: An outdoor security light, that automatically switches on at night and off in the day, shall be provided at each pump station site. Each light pole must be equipped with a hinge, pin, and wench system that allow the pole and light to be lowered to the ground for maintenance and bulb changing, and then to be raised back into an upright position. The type of light and location of the pole must be approved by the Superintendent. (9) Power disconnect: A breaker or other device as described by the Superintendent, that will completely disconnect the pump station from the power source must be provided on the main power supply line. (10) Potable water supply required:

(a) All pump stations must be supplied with a self-draining, nonfreezing ¾ inch or larger yard hydrant. The water service shall be located as close to the wet well as is practicable. (b) Back flow prevention:

(1) Potable water supply lines must be equipped with a reduced pressure principle back flow prevention device (RPZ). (2) The RPZ must be installed according to the Georgia plumbing code. (3) The RPZ must be above grade and covered with a frost proof, insulated, heated cover that is made of a corrosion proof metal such as aluminum. For recommended manufacturers, contact the Water Pollution Control Division.

(11) Fencing:

(a) Overall height for fencing shall be seven feet including three strands of barbed wire on malleable iron post tops. Posts shall be set at no more than 10 foot centers, a full three feet deep in concrete footings, poured the full size of the holes as excavated. Corner posts shall have the necessary strut and tie bracing. (b) Materials and construction:

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(1) Fence mesh: 9 gauge wire, woven to 2-inch squares, galvanized after weaving, six foot wide roll. Continuous tension wire shall be provided at the lower edge of the mesh. (2) Line post: 2-1/2-inch O.D. Galvanized Pipe (3.65 #/ft.). (3) Corner post: 3-inch O.D. Galvanized Pipe (5.79 #/ft.). (4) Gate post: 4-inch O.D. Galvanized Pipe (9.11 #/ft.). (5) Top Rail: 1-5/8-inch O.D. Galvanized Pipe (2.27 #/ft.). with extra long pressed steel sleeves. (6) Gates: shall be supplied with heavy-duty latches and keepers. (7) Gate frames: 2-inch O.D. Galvanized Pipe Frame (2.72#/ft.). (8) Barbed wire: Barbed wire shall consist of three strands of 12 gauge wire, with 4-point pattern barbs, galvanized after weaving. (9) Concrete: Concrete shall have a compressive strength of not less than 3,000 psi, with not less than 5.5 bags of cement per cubic yard and a slump between 3 and 5-inches. Ready-mixed concrete shall be mixed and transported in accordance with ASTM C 94. (10) Installation: Fence installation shall not be started before the final grading is completed, with finished grade elevations established, unless permitted by the Superintendent. (11) Damage: Repair damaged coatings in the shop or during field erection by recoating with manufacturer’s recommended repair compound, applied per manufacturer’s directions. (12) Barbed wire: install three parallel wires on each extension arm; on security side of fence, unless otherwise indicated. Pull wire taut and fastened securely to each extension arm. (13) Top rails: Top rails shall be run continuously through post caps or extension arms and shall be bent to radius for curved runs. Expansion couplings shall be provided as recommended by the fencing manufacturer.

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(14) Cleaning: Perform cleaning during installation of the work and upon completion of the work. Remove from the site all debris and equipment. Repair all damage resulting from chain link fence system installation.

(c) Access gates must be at least 15 feet wide. The location of all gates must be approved by the Superintendent.

(d) Fence crossings: Where fencing crosses ditches, steep grades, and other unusual conditions, special provisions shall be made to insure that the security, appearance, maintainability and permanence of the standard fencing are equaled or exceeded.

(e) Standards of manufacturer shall comply with the standards of the Chain Link Manufacturers Institute and all City specifications.

(f) All fencing must be provided as a complete unit produced by a single manufacturer including the required erection accessories, fittings and fasteners.

(g) For residential areas or other areas as specified by the City, a wooden privacy fence shall be used.

(12) Access roads and pavement:

(a) All access roads to pump stations must be 12 feet wide with a 30 foot turning radius.

(b) All access roads must be paved. Roads must have a 6 inch minimum base of crusher run, and a 2 inch minimum of asphalt plant mix, and a 1 inch minimum top layer of asphalt type “E”. (c) Access roads may be paved with reinforced concrete according to city specifications. (d) A paved area inside the pump station fenced area must be constructed to provide access for service vehicles to the wet well and all other facilities. (e) A paved turn around must be provided for service vehicles. (f) All paved areas must be contiguous with the paved access road.

(13) Unpaved areas: All unpaved areas inside the fenced area must be covered with a minimum of 4 inches of crusher run. The finished grade shall be sloped so that all water drains away from the pump station site.

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(14) Hoist or crane: A hoist or crane must be included with each station. Each hoist or crane must be properly sized and placed to facilitate the removal of each pump from the wet well. The hoist system shall be designed so that the pumps can be lifted from the wet well and placed on a platform or maintenance vehicle easily. The hoist shall also be capable of lowering and raising maintenance personnel into and out of the wet well. Special care should be taken to ensure that the proper length and strength of hoist cable is provided. Electric hoists must be provided for each crane and hoist system. Manual hoists are prohibited. (15) Valve vaults: Pump station check valves and isolation valves must be housed in a below grade, concrete valve vault, separate from but immediately adjacent to the wet well.

(a) The discharge piping from each pump shall be routed through the valve vault with check valves and shutoff valves on horizontal stretches of pipe. Check valves shall be placed upstream of shutoff valves. Connection of the discharge pipes should be accomplished outside and downstream of the valve vault. (b) A pressure gage with diaphragm mounted seals should be located on the sides of each pipe in the valve vault, upstream of the check valve. (c) The valve vault should have a reinforced concrete floor and top slab with a hinged aluminum floor door. The vault walls may be precast concrete. The valve vault should have a maximum depth of 4 feet unless specifically approved by the Superintendent. (d) The floor of the valve vault should be sloped to a sump to collect water. A drain should be provided in the sump. The drain should be routed to the wet well with a P-trap installed to prevent the release of hazardous gases into the valve vault. A backwater valve shall be installed in the drain line to prevent flooding of the valve vault by backflow from the wet well.

(16) Corrosion prevention: The first manhole up stream from the pump station and the first manhole downstream from the pump station, the wet well itself, and all valve boxes must be coated with a two part epoxy (such as Protecto 401 Ceramic Epoxy or Mainstay DS-4 coal tar epoxy mortar) to prevent corrosion from hydrogen sulfide gas.

(D) CONTROL PANELS:

(1) General: The control system shall be designed to operate the required number of pumps specified on the drawing at the power characteristics

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shown on the plans. The control function shall provide for the operation of the pumps under normal conditions, and shall alternate the pumps on each pump down cycle to equalize the run time. In the event the incoming flow exceeds the capacity of the lead pump, subsequent pumps shall automatically startup to handle the increased flow. As the flow decreases, the pump shall cut off at the elevations as shown on the plans. The control shall function as described below. The equipment listed below is a guide and does not relieve the supplier from supplying a system that will function as required. (2) Electrical enclosures: All pump station electrical components and controls must be housed in a weatherproof, water tight, 14 gauge, NEMA 4X rated enclosure manufactured from 304 stainless steel. The enclosure shall be a wall mounted type with a minimum depth of 12 inches, sized to adequately house all the components. The door gasket shall be rubber composition with a retainer to assure a positive weatherproof seal. The door shall open a minimum of 180 degrees. (3) Inner dead front door: A polished, aluminum dead front shall be mounted on a continuous aircraft type hinge. It shall contain cutouts for mounted equipment, and provide protection of personnel from live, internal wiring. Cutouts for breaker handles shall be provided to allow operation of breakers without entering the compartment. All control switches, indicator pilot lights, elapsed time meters, duplex receptacle, and other operational devices shall be mounted on the external surface of the dead front. The dead front shall open a minimum of 150 degrees to allow access to equipment for maintenance. A ¾ “ break shall be formed around the perimeter of the dead front to provide rigidity. (4) Back plate: the back plate shall be manufactured of 12 gauge steel and be finished with a primer coat and two (2) coats of baked on, white enamel. All hardware mounted to the subpanel shall be attached with machine thread, tapped holes. Sheet metal screws are not acceptable. All devices shall be permanently identified. (5) Power distribution: The panel power distribution shall include necessary components and be completely wired stranded copper conductors rated at 90 degrees C. All conductor terminations shall be as recommended by the device manufacturer. Control power to the panel, including all alarm and telemetry circuits shall be provided by an uninterruptable power supply (UPS). (6) Circuit breakers: All circuit breakers shall be heavy duty thermal magnetic motor circuit protectors similar and equal to Square D Type FAL. Each motor breaker shall be adequately sized to meet the pump motor operating characteristics and shall have a minimum of 14,000 amps interrupting capacity at 480 VAC. The control circuit shall be controlled by

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heavy duty breakers. Circuit breakers shall be indicating type, providing “on-off-trip” positions of the operating handle. When the breaker is tripped automatically, the handle shall assume a middle position indicating “trip”. Thermal magnetic breakers shall be quickmake and quick-break on manual and automatic operation and have inverse time characteristics secured through the use of bimetallic tripping elements supplemented by a magnetic trip. Breakers shall be designed so that an overload on one pole automatically trips and opens all legs. Field installed handle ties shall not be acceptable. (7) Motor starters (across-the-line): motor starters shall be open frame, across-the-line, NEMA rated with individual overload protection in each leg. Motor starter contacts and coil shall be replaceable from the front of the starter without removal from its mounted position. Overload heaters shall be block type, utilizing melting alloy spindles and shall have visual trip indication. Overloads shall be sized for the full load amperage draw of the pumps. Adjustable type overloads, definite purpose contactors, fractional size starters and horsepower rated contactors or relays shall not be acceptable. (8) Motor starters (reduced voltage autotransformer): motor starters shall be open frame, reduced voltage, autotransformer, NEMA rated with individual overload protection in each phase. Motor starter contacts and coil shall be replaceable from the front of the starter without removal of the starter from its mounted position. Overload heaters shall be blocked type, utilizing melting alloy spindles sized for the full load amperage of the load. Adjustable overload, definite purpose contacts, fractional size starters and horsepower rated contact or relays shall be acceptable. Motor starter resets shall be provided on the front of the dead front. (9) Motor starters (solid state reduced voltage): Motor starters shall be solid state reduced voltage starters to provide smooth, stepless acceleration through the use of silicon controlled rectifiers. By gradually applying voltage to the motor, a soft start condition will accelerate the motor to full speed. The adjustable current-limit feature: the starters shall limit currents to 25%-70% and starting torque to 6%-49% respectively of full voltage values. Adjustable ramp shall be for 1 – 30 seconds. A ramp down signal may be required and must be available on the starters. Motor protection shall be provided by calculation of temperature rise of the motor and starter and shut the motor down in case of an out of tolerance condition. (10) Probe controller system: A conductance actuated MutiTrode control system shall be provided. The system shall utilize a one-piece multi-sensored probe and an indicating controller with necessary intrinsic barriers to both operate pumps at designated levels and actuate alarms as required. The Multitrode MT2PC/MT3PC is a self-contained switchboard

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device used to control pumps and alarms. Status information for pumps, pump fault, mode of operation, next pump to start, and level alarms are clearly indicated on the front display. The Mt2PC/MT3PC incorporates the main control components of standard pump panels. It allows all essential operating parameters to be adjusted via the front keypad or communication port. This includes setting levels, time delays, sensitivities, pump alternation, hand-off-automatic selection, and fault resets. It will accept level information from a MultiTrode probe or an analog device (4-29 mA or 0-10 V). The keypad can be disabled to prevent unauthorized keyboard entry. The MT2PC/MT3PC also provides a communication link for the connection of other MultiTrode equipment or “smart” monitoring and control equipment.

(11) High level float switch - A liquid level float sensor shall be installed for back-up alarm (SCADA and local) capability in case of Multitrode failure. (12) Level control systems: the control system shall provide for the automatic and manual control and alternation of the pumps to maintain a pumped down condition of the wet well. Levels shall be sensed through a measurement device adjusted to the specified levels. The device shall sense the “off”, “lead”, “lag”, and “alarm” levels. As the level in the wet well rises, the lead pump, as determined by the alternator, shall start and pump the station to the “off” level. In the event the incoming flow exceeds the capacity of the lead pump, the lag pump shall start and both pumps shall run to the “off” level. If the level continues to rise, the second “lag” pump shall start and all pumps shall run to the “off” level. If the level continues to rise, alarm functions shall be activated. The control system shall include, but not be limited to, the ancillary equipment listed below. (13) Ancillary equipment:

(a) MOA (Manual/Off/Automatic) switches: A three-position MOA switch shall be provided for each motor. The switch shall be NEMA 4X rated with 10 amp contacts. A position indicating legend plate shall be provided. The MOA switches shall be mounted on the dead front door. The MOA in the Manual position will allow the pump to run and bypass all safety shutdowns except for the overloads. In the Automatic position the MT2PC/MT3PC will control the pumps while monitoring all shutdowns. (b) Run indicators: A green run pilot indicator shall be mounted on the dead front door. (c) Elapsed time meter: An elapsed time meter shall be mounted on the dead front door. The meter shall operate on 120 VAC, shall indicate in hours (6 digits) and tenths and shall not be resetable.

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(d) Moisture and thermal measurement: A plug-in, solid state control and status relay with indicating LEDs shall be provided to measure motor thermal overload and moisture in the pump housing. Any moisture or thermal condition shall signal failure and stop the pump. The failure mode shall also be indicated by an illuminated light on the MT3PC controller. (e) Heater: An internal 100 watt heater shall be provided to maintain temperature above the dew point. The unit shall be thermostatically controlled. (f) Trouble light: An internal trouble light shall be installed to illuminate the internal portion of the enclosure. (g) Alarm system: A visible alarm light shall be installed on the exterior of the control panel and shall be a weatherproof, shatterproof, red light fixture with a 40 watt bulb to indicate alarm conditions. The alarm light shall be turned on by the alarm relay. An audible alarm such as a bell, horn, or buzzer must be installed. The audible alarm shall be turned on by the alarm relay. (h) Lightening-transient protection: Each complete suppression unit shall be UL listed as a secondary surge arrestor and bear CSA certification and meet ANSI/IEEE C62-11-1987; suitable for indoor and outdoor applications; suitable for use in service entrance location; meet requirements of NEC Article 280; rated at 650V phase-to-ground maximum. (i) Transformers: Control transformers shall be provided to produce the 120 VAC and/or 24 VAC for control circuits. Transformers shall be fused on the primary and secondary circuits. The secondary circuits shall be grounded. (j) Phase monitor: A line voltage rated, adjustable phase monitor shall be installed to sense low voltage, loss of power, reverse phase, and loss of phase. Control circuit shall de-energize upon sensing any of the faults and shall automatically restore service upon return to normal power. (k) Drawings A final, “as built” drawing encapsulated in mylar shall be attached to the inside of the front door. A list of all legends shall be included. (l) Panel markings: All component parts in the control panel shall be permanently marked and identified as they are indicated on the drawing. Marking shall be on the back plate adjacent to the component. All control conductors shall be identified with wire

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markers at each end, as close as practical to the end of the conductor. (m) Testing: All panels shall be tested to the power requirements as shown on the plans to assure proper operation of all components. Each control function shall be activated to check for proper indication. (n) Guarantee: All equipment shall be guaranteed for a period of three (3) years from the date of shipment. The guarantee is effective against all defects in workmanship and/or defective components. The warranty is limited to replacement or repair of the defective equipment. (o) Manufacturer: The manufacturer shall be a UL listed shop for industrial control systems and shall indicate evidence of such on the control panel enclosure. (p) Phase convertors: Phase converters will not be accepted unless specifically approved by the superintendent.

(E) EMERGENCY POWER BACKUP REQUIRED:

(1) Generator brand: The brand of generator accepted by the city is limited to Cummins-Onan or Caterpillar. (2) Sizing: The engine / generator set shall be sized to accommodate all loads at the pump station. (3) Hot water jacket: A hot water jacket shall be supplied to keep the engine warm and ready to operate. (4) Storage battery: A storage battery should be provided with each engine / generator along with a trickle charger fed off commercial power. (5) Fuel type: Where available, all 100 kW (or smaller) generators must be fueled by natural gas. All 101 kW or larger must be fueled by diesel. (6) Automatic transfer switches: An automatic transfer switch must be installed separately from (not inside) the control panel. Automatic transfer switches should be supplied by the manufacturer of the generator.

(a) Simultaneous starting of two pumps should be prevented. A reasonable generator run time should be provided before pump start and after primary power returns.

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(b) A connection should be provided so that the generator can power an external, portable load bank for maintenance purposes.

(7) Generator receptacle: The Superintendent may require the control panel to have a generator receptacle mounted to the side. The receptacle brand must be Crouse Hinds, AR2042 for 230V and DF4404 for 480 V. (8) Housing: Weatherproof, sound attenuated steel housing with lockable, hinged doors and Critical Grade Exhaust Silencer with mounting hardware. Silencer mounting kit, tail pipe and rain cap. (9) Engine Cooling System: Unit Mounted Radiator w / pusher fan 50 Ambient Low Coolant Level Shutdown (10) Engine Heating System: Engine Block and Coolant Heater, 120 V, 2500 Watts 40 F Minimum Ambient Temperature. (11) Automatic exercise cycling: Generators must be set up for automatic exercise cycling. (12) Engine Fuel System: Flexible Fuel Lines Sub-base Fuel Tank sized for 24 Hours of Continuous Operation at Full Load. Double Wall Construction, Skid Mounted, With Leak Detection Monitoring, U.L. Listed, Fuel Level Gauge, Low Fuel Level Alarm. (13) Engine Electrical Equipment: Battery Rack and Cables, Starting Batteries – 2 @ 12 volts, lead acid type, Battery Charging Alternator - 60 Hz DC, 10 Amp Battery Charger, 120 Volts AC, 24 Volt DC Starter (14) Governor: Electronic Isochronous Governor (15) Electrical Accessories: Main Line Circuit Breaker, Mounted on Generator, 3 Pole, 600 Amps Per Pole, Voltage Regulator +/- 2% Safeguard Breaker. (16) Controller and Alarms: Engine Pre-Alarm Senders to include: Pre-high Engine Temperature Alarm, Pre-low Oil Pressure Alarm Low Engine Temperature Alarm. (17) Other Genset Requirements: Skid End Caps, Spring Type Vibration Isolators – External to Skid Base. (18) Automatic Transfer Switch Requirements: Application: Utility to Genset, 800 Amp, 3 phase, 3 pole, 277/480 volts, seven day exerciser clock, pilot lights on door to show switch position, pilot light on door to show normal is available, adjustable time delay on engine start, adjustable time delay for cool-down after re-transfer to normal before stopping, test

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switch on door, plant exerciser with load, in-phase monitor both directions. (19) Additional Requirements: 5 – Year Comprehensive Warranty, 2 sets of owner’s/operator’s manuals to be provided prior to delivery of equipment. Initial start-up to be performed by manufacturer’s representative –includes warranty validation, engine oil and antifreeze must be provided and installed at start up by manufacturer. (20) Communications: the generator controller must be compatible with the City’s SCADA and RTU systems as described below.

(F) MONITORING DEVICES – REMOTE TERMINAL UNITS (RTUs) SUPERVISORY CONTROL AND DATA ACQUISITION (SCADA)

(1) SCADA system brand: Advanced Control Systems (ACS). Each Pump Station must be equipped with an RTU that will communicate with the City of LaGrange Utilities SCADA system. All system upgrades to the City’s SCADA system required for the efficient operation of each individual RTU shall be included. The following items are required:

(a) OpEn Connect NTU-7575 Remote Terminal Unit, with ACS-7000/R2 or DNP 3.0 Master protocol, and equipped with:

• 8 DC Analog Inputs (0-+/- 1 mA) • 8 Digital inputs (status/Accum.) • 4 Momentary Control Outputs, 10A, 277Vac relays, 4 pairs (8

relays) • One Isolated RS-232 Interface (070577) & Cable to MDS-

9710 radio for Master Station Communications • One RS-232 Configuration & Monitor port • One 120 Vac External Power Supply, with cables for use with

Radio/RTU & 7AH battery, 500092 • Thermostatically controlled cabinet heater • NEMA 4X Stainless Steel, Wall-mount enclosure, 24x24x8

(b) Microwave Data Systems Model 9710, 800-960 MHz, 12Vdc input, 9600 baud. City of LaGrange to supply correct frequencies. Radio installed & wired in item (a) by ACS. (c) Yagi Antenna, 10 db, 9-element, 880-960 MHz, with 30 feet 1/2" Heliax foam antenna cable, connectors, Ground Kit, 3 foot Super-flex cable, and Polyphaser Surge Protector . (d) Mounting masts or poles. Contractor shall furnish all mounting masts or poles as required to support the antennas at the elevations and orientations required for reliable communications with the City of LaGrange Utilities SCADA System. Masts and poles

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shall be suitable for outdoor environmental conditions, provide adequate support and protection for transmission lines and be provided complete with all necessary mounting accessories.

(G) LANDSCAPING: (1) When required by the City, landscaping trees, such as Leland Cypresses must be planted around the perimeter of the station. This includes, but is not limited to; those pump stations in subdivisions and other residential areas. (2) All native brush and trees must be removed from the pump station site except where prohibited by the City. (3) A “soil sterilizer” that has been properly applied to the entire pump station site may be required by the City.

(H) SPARE PARTS:

(1) Spare pumps / pump parts: The Developer must supply the City with a spare pump with each pump station (2) Spare fuses: One of each of the fuses that are used in the electrical control system must be provided to the City. (3) Spare probe: an extra Multitrode probe must be supplied with each station.

(I) START UP:

(1) The developer, the pump manufacturer’s representative, the generator manufacturer’s representative, the design engineer, the superintendent, and any other associated parties must be present at “start up”. (2) The pump manufacturer’s representative must inspect each pump for proper rotation, pumping capacity, vibration, and amperage draw. (3) The generator manufacturer’s representative must test the generator and transfer switch for proper operation at full load. (4) Each pump must be removed from and reinstalled into the wet well to demonstrate that the pumps can be easily maneuvered for maintenance

purposes. (5) All keys and spare parts must be submitted to the City.

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(J) INFORMATION SUBMITTAL REQUIRED AT START UP:

(1) Three sets of as-built drawings. (2) Three sets of detailed drawing schematics. (3) Three sets of manufacturer’s operation and maintenance (O&M) literature for each piece of equipment at the station. (4) Three copies of each pump curve and design calculations. (5) The name, address, and telephone number for the developer, design engineer, contractors, subcontractors, and manufacturers’ representatives. (6) Final acceptance and payment will be withheld until the Superintendent signs off that all documentation has been received and start-up requirements completed.

(K) FLOOD PLAIN REQUIREMENTS: The pump station, fenced area, access road, and all equipment shall be above the 100 year flood plain. The construction plans must show the flood plain limits. (L) RESERVED RIGHT TO CHANGE THESE REQUIREMENTS WITHOUT NOTICE: The City of LaGrange reserves the right to make changes to these specifications without notice. In the event these specifications conflict with another set of specifications, an ordinance, or law, the more restrictive requirement shall prevail.

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